import java.text.DecimalFormat;

public class ClientTest {

    public static void main(String[] args) {

        DecimalFormat df = new DecimalFormat("#.00");
        double d = 86.456815654;
        System.out.println(df.format(d));
        Student student = new Student();
        student.examRecord.accuracy = 0.88456;
        student.examRecord.answeredQuestionNumber = 77;
        student.examRecord.examTimes = 12;
        student.examRecord.averageScore = 76.4516845;
        student.showExamRecord();
    }
}
